<!DOCTYPE html>
<meta charset="UTF-8">
<title>CSS Highlight API Test Reference</title>
<head>
  <style>
    div {
      width: 200px;
      height: 100px;
    }
    #h1 {
      text-underline-offset: 1svw;
      text-decoration-line: underline;
      text-decoration-color: green;
      text-decoration-thickness: 2svh;
    }
  </style>
</head>
<body>
  <div id="h1">With container size</div>
</body>